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A vector is represented by 3hati+hatj+2h...

A vector is represented by `3hati+hatj+2hatk`. Projection of this vector in XY plane is

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`vecR=3hati+hatj+2hatk`
`:.` Length in XY plane `=sqrt(R_(x)^(2)+R_(y)^(2))=sqrt(3^(2)+1^(2))=sqrt(10)`
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